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Human Health Screening Evaluation <br /> US Can—Welty Road March 19,2012 <br /> • Fluoranthene <br /> • Indeno(1,2,3-cd)pyrene <br /> • Phenanthrene <br /> • Pyrene <br /> Air Concentrations of VOCs from Soil <br /> SAIC used the estimated air concentration of VOCs volatilized from on-site soils into ambient <br /> air to estimate inhalation exposures, and subsequently inhalation hazards and risks from those <br /> chemicals. The concentration of VOCs in ambient air from on-site soils was calculated using the <br /> following equation(PEA Guidance Manual, Figure 2.7): <br /> Ca=Ei/99 <br /> Where: <br /> Ca= ambient air concentration, mg/m3 <br /> Ei=total emission rate for compound i (mg/second) <br /> Air concentrations of the following volatile chemicals (PEA Guidance Manual) were estimated <br /> using this equation(Table 18): <br /> • Acenaphthene <br /> • Anthracene <br /> • Benzene <br /> • Ethylbenzene <br /> • Fluorene <br /> • Naphthalene <br /> • Toluene <br /> • Xylenes <br /> Emission Rate for VOCs <br /> SAIC calculated the emission rates from on-site soils to ambient air for VOCs (Table 19)using <br /> the following equation(PEA Guidance Manual, Figure 2.6): <br /> 1-6 X 10' XDiX HcX Ci <br /> E! - d <br /> 0.023 <br /> ix <br /> .284 + 0.046 x K e <br /> H, <br /> Where: <br /> Ei=average emission rate of contaminant i over the residential lot during the exposure <br /> interval, mg/sec <br /> Di=diffusivity in air for compound i, square centimeters per second (cm2/sec) <br /> He =Henry's Law constant, atmosphere (atm)-m3/mole <br /> Kd= soil-water partition coefficient, cm 3/g <br /> 9 SALE <br />